Thfi hiện tại hoàn thành 21/ She’s got the best voice I (ever hear)…............................................…… 22/ Since when………………you (learn )…...............................… English? - I (learn )……….....……it since I (be ).........................………a girl of twelve. 23/ They (do )……………………nothing since they (get )…………………… up. 24/ I (write )……………….....................………two letters already. 25/ - I (fly) ................................................... over Loch Ness last week. - You (see) ............................... the Loch Ness monster? 27/ This is the first time the children (travel)……..……………………..by plane. 28/- You (be).......................................here before? - Yes, I (spend)....................................... my holidays here last year. 29/ - The newspaper (come) .............................................? - Yes, Ann is reading it. 30/ Shakespeare (write) ................................................ a lot of plays.